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Confirming the Formation of Hydroxyl Radicals in the Catalytic Decomposition of H2O2 on Metal Oxides Using Coumarin as a Probe
ChemCatChem ( IF 3.8 ) Pub Date : 2019-10-18 , DOI: 10.1002/cctc.201901316
Annika Carolin Maier 1 , Ena Herceglija Iglebaek 1 , Mats Jonsson 1
Affiliation  

Hydrogen peroxide can be catalytically decomposed to O2 and H2O on metal oxide surfaces in contact with aqueous solutions containing H2O2. The initial step in this process has been proposed to be the formation of surface‐bound hydroxyl radicals which has recently been verified using tris as a radical scavenger. Here, we make use of the unique fluorescent product 7‐hydroxycoumarin formed in the reaction between hydroxyl radicals and coumarin to probe the formation of surface‐bound hydroxyl radicals. The experiments clearly show that 7‐hydroxycoumarin is formed upon catalytic decomposition of H2O2 in aqueous suspensions containing ZrO2‐particles and coumarin, thereby confirming the formation of surface‐bound hydroxyl radicals in this process. The results are quantitatively compared to results on the same system using tris as a probe for hydroxyl radicals. The effects of the two probes on the system under study are compared and it is concluded that coumarin has a significantly lower impact on the system.

中文翻译:

以香豆素为探针,确认H2O2在金属氧化物上的催化分解中羟基自由基的形成

过氧化氢可被催化分解至O 2和H 2 O于与含有H的水溶液接触的金属氧化物表面2 Ò 2。已提出该过程的第一步是形成表面结合的羟基自由基,最近已使用tris作为自由基清除剂对其进行了验证。在这里,我们利用在羟基自由基和香豆素之间的反应中形成的独特的荧光产物7-羟基香豆素来探测表面结合的羟基自由基的形成。实验清楚地表明,在含有ZrO 2的水悬浮液中H 2 O 2催化分解时会形成7-羟基香豆素颗粒和香豆素,从而确认了该过程中表面结合的羟基自由基的形成。将结果与使用tris作为羟基自由基探针的同一系统上的结果进行定量比较。比较了两种探针对所研究系统的影响,得出的结论是香豆素对系统的影响要低得多。
更新日期:2019-10-19
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